Many of the Docker images on hub.docker.com are outdated. The one
specified in the documentation doesn't exist anymore. We provide a
decent Dockerfile to build our own Docker image.
This uses a multi-stage build to avoid polluting the final image with
the intermediate artifacts. The final image is 155 MB. It should be
possible to squeeze it even more by using Alpine Linux for the last
two parts instead of Stretch.
The service is using gunicorn. The user is expected to complete the
installation with a reverse proxy configuration.
The SysVinit script is not tested, but it looks fine to me. Also added a
few lines on how to execute `isso` when using a virtualenv from the
outside (both changes suggested on IRC).
Vincent Bernat